Fan



Filed June 11, 1928 Fig.1.

INVENTOR. W/ZLA R0 WAZLACEDE/WV/S.

ATTORNEY Patented Aug. 20, 1929.

WILLARD WALLACE DENNIS, LOS ANGELES, CALIFORNIA.

FAN. f

Application filed June 11, 1923. Serial No. 284,467.

This invention relatesto fans for moving air, grains or other substances.

The general object of the inventlon is to provide an improved fan by means of whlch increased suction may be obtamed and con sequently a greater volume of air or other substance moved, in proportion to the size of the fan, than is possible-with the most eflicient fans now in use.

A more particular object is to provide a fan by means ofwhich a vacuum is created in its inlet, whereby the suction of the fan is greatly increased and likewisethevolume of air or other substance moved by the fan.

A further object is to provide a fan which will be simple, inexpensive and highly efficient in operation.

Other objects and advantages W111 appear hereinafter. I

The invention is illustrated in the annexed drawing which form a part of this specification and in which Fig. 1 isa view partly in side elevation and partly in longitudinal section of a fan embodying my invention.

Fig. 2 is an end elevation of the fan looking at the inlet end of the fan.

Qbrresponding parts are designated by the same reference characters in all the figures.

My fan includes generally a drive shaft 1, a central, member or hub 2, a plurality of spiral blades 3, an intake casing' l and an outlet regulating member 5.

The central member 2 is screw seated at one end at 6 on the drive shaft 1 and is formed with a semi-spherical indentation or recess 7 in its other or outer end. .The cen-' tral member is formed at its inner end with i an external annular flange 8 and the member tapers from said end to its outerv end. The blades 3 are formed integral with the central member in a rifled position while the intake casing 4 is formed integrat with the periphery of said blades with the outer or.

intake end of the central member, preferably disposed intermediate the outer and inner ends of said casing. The central member 2, blades 3 and intake casing 4 being formed integral rotate together as a unit with the shaft 1. The outer end of the intake casing 4 forms the inlet 9 of the fan,

while the outlet 10 is formed between thev inner end of the intake casing and the rear portion and flange 8 of the central member 2.

The drive shaft 1 may be driven by any suitable source of power, preferably y an greatly electric motor 11, which may be formed mm an elongated bearing 12 in which the shaft 1 may be journaled and on which bearin may be slidably mounted a sleeve 13 formed in the center of andjntegral with the outlet regulating member 5. A knob 14 may be formed on the member 5 for sliding the-same over the outlet 10 or'away from the outlet for regulating thevolume of air or other substance moved by the fan.

. The operation of my fan is as follows:

The central member 2, blades 3 and intake casing 4 being rotated as a unit by'the motor 11 through the shaft 1, air is drawn through the inlet 9 by the blades 3 and through the intake casing 4 and delivered through the outlet 10. The air in the recess 7 is thrown outward by centrifugal force and discharged at the rim of said recess, thus creating an area of reduced pressure in said recess into which outside air is drawn and in turn thrown out and delivered-at the blades .at

the rim of the recess. The reduced pressure in the recess which continually draws additional air into the intake casing 4, in-

creases the suction of the fanfand such ad 1 ditional air, being drawn out of the recess by centrifugal force and delivered with the rest of the air drawn through the fan, increases the volume of air moved by the fan. i

Various changes in the construction of the fan may be made without departing from the spirit of the invention. 1

- I claim. as my invention:

1. 'A- fan comprising a' central member formed with an intake vacuum recess in its' I intake end, blades on said central member, and an Intake caslng surrounding said blades and central member.

2. A fan comprising a central member,

a vacuum in the center of the intake end of J said intake casing. 3. A fan compri'smg a central member formed with an intake vacuum recess in its intake end, blades formedv on said central.

member, and an intake casing surrounding said blades and central member and formed integral with. said blades.

4; A fan comprising a central member, blades, and an intake casing rotatable as a umt, and means for creating a vacuum in the center of the intake-end of said intake casing during rotation of said central member, blades and casing.

5. A fan comprising a tapered central member, blades on said member, an intake casing surrounding said blades, means for creating a vacuum in the intake end of said casing toincrease the suction, said central ,member being tapered to deliver the air from the fan at right angles thereto.

6. A fan comprising a central*member,

- blades .011 said central member, an intake casing surrounding said blades, said'central member being constructed and arranged to discharge the air at right angles to the axis of'the fan from the rear end of said casing,

[and a sleeve mounted to slide over the rear portion of the fan for regulating the outlet at the rear of said intake casing.

7. A fan comprising a central rearwardly tapered member formed with a recess in its intake end, spiral blades on said central member, an intake casing surrounding said central member and'blades, the intake end of said central 'member being located rear- Wardly of the intake end of said casing, the

outer edges of said blades extending to the intake end ofsaid casing and the inner edges of said blades extending only to the intake end of said central member, and means for rotating said central member.

WILLARD WALLACE DENNIS.- 

